SX8650 Datasheet, PDF (17/56 Pages) Semtech Corporation – World’s Lowest Power & Smallest Footprint 4-wire Resistive Touchscreen Controller with 15kV ESD

SX8650
World’s Lowest Power & Smallest Footprint 4-wire
Resistive Touchscreen Controller with 15kV ESD
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
3. Functional Description
3.1. General Introduction
This section provides an overview of the SX8650 architecture, device pinout and a typical application.
The SX8650 is designed for 4-wire resistive touch screen applications (Figure 8).The touch screen or touch panel is the
resistive sensor and can be activated by either a finger or stylus. The touch screen coordinates and touch pressure are
converted into I2C format by the SX8650 for transfer to the host.
VDD
SX8650 _AUX
Control
A0
X+
Y+
X-
Touch
Screen
Y- ^Interface
GND
Vref
NRST
POR OSC
I2C
SCL
ref+
in ADC out
ref-
Digital
Filter
SDA
NIRQ
HOST
Figure 8. SX8650 with screen
ACS Revision V2.15/October 2009
©2009 Semtech Corp.
Page 16
www.semtech.com